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dekker.one
1/* -*- mode: C++; c-basic-offset: 2; indent-tabs-mode: nil -*- */
2/*
3 * Main authors:
4 * Christian Schulte <schulte@gecode.org>
5 *
6 * Copyright:
7 * Christian Schulte, 2007
8 *
9 * This file is part of Gecode, the generic constraint
10 * development environment:
11 * http://www.gecode.org
12 *
13 * Permission is hereby granted, free of charge, to any person obtaining
14 * a copy of this software and associated documentation files (the
15 * "Software"), to deal in the Software without restriction, including
16 * without limitation the rights to use, copy, modify, merge, publish,
17 * distribute, sublicense, and/or sell copies of the Software, and to
18 * permit persons to whom the Software is furnished to do so, subject to
19 * the following conditions:
20 *
21 * The above copyright notice and this permission notice shall be
22 * included in all copies or substantial portions of the Software.
23 *
24 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
25 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
26 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
27 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
28 * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
29 * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
30 * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
31 *
32 */
33
34#include <gecode/int/channel.hh>
35
36namespace Gecode { namespace Int { namespace Channel {
37
38 forceinline
39 LinkSingle::LinkSingle(Space& home, LinkSingle& p)
40 : MixBinaryPropagator<BoolView,PC_BOOL_VAL,IntView,PC_INT_VAL>
41 (home,p) {}
42
43 Actor*
44 LinkSingle::copy(Space& home) {
45 return new (home) LinkSingle(home,*this);
46 }
47
48 PropCost
49 LinkSingle::cost(const Space&, const ModEventDelta&) const {
50 return PropCost::unary(PropCost::LO);
51 }
52
53 ExecStatus
54 LinkSingle::propagate(Space& home, const ModEventDelta&) {
55 if (x0.zero()) {
56 GECODE_ME_CHECK(x1.eq(home,0));
57 } else if (x0.one()) {
58 GECODE_ME_CHECK(x1.eq(home,1));
59 } else {
60 assert(x0.none() && x1.assigned());
61 if (x1.val() == 0) {
62 GECODE_ME_CHECK(x0.zero_none(home));
63 } else {
64 assert(x1.val() == 1);
65 GECODE_ME_CHECK(x0.one_none(home));
66 }
67 }
68 return home.ES_SUBSUMED(*this);
69 }
70
71}}}
72
73// STATISTICS: int-prop